Multiplex communications – Special services – Special feature of multiplex telephone terminal
Reexamination Certificate
2007-10-23
2007-10-23
Pham, Chi (Department: 2616)
Multiplex communications
Special services
Special feature of multiplex telephone terminal
C370S352000, C370S463000, C370S465000, C379S088250, C379S093070, C379S216010
Reexamination Certificate
active
09583695
ABSTRACT:
Method for maintaining a virtual presence of a first remote telephone user in a PBX system having a frame relay network connection between two endpoint routers while permitting the first remote user to make local calls includes first signaling a PBX to represent the remote telephone as being off hook; routing a telephone call placed at the remote telephone in accordance with a defined protocol; and when the routed telephone call is terminated, second signaling the PBX to restore the on-hook status of the remote telephone. Preferably, the first and second signaling are performed in-band, in accordance with an FRF.11 or VToA AAL2 voice over packet protocol. The telephone call-routing may be to a public switched telephone network (PSTN) local to the remote telephone or it may be to another remote telephone user at the same site within the PBX system as the first remote telephone user. The signaling is to a PBX station interface associated with the PBX, so that the PBX in normal response refuses or stores incoming calls directed to the remote telephone for the call's duration. Apparatus includes a mechanism for selectively routing a telephone call placed at a PBX-connected telephone to the local PSTN; a mechanism for first signaling the PBX that the PBX-connected telephone is temporarily incapable of receiving calls; a mechanism for detecting a termination of such a PSTN-routed telephone call; and a mechanism responsive to the detecting mechanism for second signaling the PBX that the PBX-connected telephone again is capable of receiving calls.
REFERENCES:
patent: 4975903 (1990-12-01), Wakerly et al.
patent: 5463672 (1995-10-01), Kage
patent: 5602846 (1997-02-01), Holmquist et al.
patent: 5822405 (1998-10-01), Astarabadi
patent: 5889845 (1999-03-01), Staples et al.
patent: 5917817 (1999-06-01), Dunn et al.
patent: 6141341 (2000-10-01), Jones et al.
patent: 6389276 (2002-05-01), Brilla et al.
patent: 6430176 (2002-08-01), Christie, IV
patent: 6445696 (2002-09-01), Foodeei et al.
patent: 6563918 (2003-05-01), Nelson et al.
patent: 6574239 (2003-06-01), Dowling et al.
patent: 6700956 (2004-03-01), Chang et al.
patent: 2003/0128819 (2003-07-01), Lee et al.
Cisco Technology Inc.
Hom Shick
Marger & Johnson & McCollom, P.C.
Pham Chi
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